Benchmarking beam alignment for a clinical helical tomotherapy device

John Balog, T. R. Mackie, D. Pearson, Susanta Hui, Bhudatt Paliwal, Robert Jeraj

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


A clinical helical tomotherapy treatment machine has been installed at the University of Wisconsin Comprehensive Cancer Center. Beam alignment has been finalized and accepted by UW staff. Helical tomotherapy will soon be clinically available to other sites. Clinical physicists who expect to work with this machine will need to be familiar with its unique dosimetric characteristics, and those related to the geometrical beam configuration and its verification are described here. A series of alignment tests and the results are presented. Helical tomotherapy utilizes an array of post-patient xenon-filled megavoltage radiation detectors. These detectors have proved capable of performing some alignment verification tests. That is particularly advantageous because those tests can then be automated and easily performed on an ongoing basis.

Original languageEnglish (US)
Pages (from-to)1118-1127
Number of pages10
JournalMedical Physics
Issue number6
StatePublished - Jun 1 2003


  • Beam alignment
  • Commissioning dosimetry
  • Multileaf collimator
  • Tomotherapy


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